Add contractors by residence endpoint and Bruno API collection

- Add GET /contractors/by-residence/:residence_id/ endpoint
- Create comprehensive Bruno API collection (89 endpoints)
- Collection covers all API endpoints with Local and Dev environments

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

bruno-collections/casera-api/environments/Dev.bru

@@ -0,0 +1,5 @@
+vars {
+  base_url: https://casera.treytartt.com
+  api_url: {{base_url}}/api
+  auth_token: your-auth-token-here
+}